Flexible Electrochemical Sensor Constructed Using an Active Copper Center Instead of Unstable Molybdenum Carbide for Simultaneous Detection of Toxic Catechol and Hydroquinone

Author links open overlay panelJiabao Zuo, Yuliang Shen, Luyao Wang, Qi Yang, Zheng Cao, Haiou Song^*, Zhiwen Ye, Shupeng Zhang^*

ABSTRACT

A new electrochemical sensor based on a Cu-CuO@MoO_x-modified polyethylene terephthalate electrode spin coated with PEDOT (Cu-CuO@MoO_x-PEDOT/PET) was developed for simultaneous determination of catechol (CT) and hydroquinone (HQ). A zerovalent copper and copper(II) oxide intercalated molybdenum oxide MoO_x (x = 2 or 3) hybrid nanomaterial (Cu-CuO@MoO_x) by introducing active copper catalytic centers into the Mo₂C@MoO_x system based on unstable Mo₂C, and replaced Mo₂C using a simple hydrothermal method. At room temperature, the Cu-CuO@MoO_x-PEDOT/PET electrode demonstrated the lowest detection limits of 0.216 and 0.221 μM for CT and HQ (S/N = 3), respectively. In addition, the applicability of this method was proven by the recovery of CT and HQ in spiked tap water samples. The Cu-CuO@MoO_x-PEDOT/PET flexible electrode had strong anti-interference ability, good repeatability and long-term stability. It was used in the detection of CT and HQ in Nanjing tap water, the recoveries of CT and HQ calculated from the i–t curve were 99.36% and 97.56%, respectively. Most importantly, the flexible electrode could still maintain relatively stable electrochemical responses under different bending and folding conditions, and the obtained relative standard deviations (RSDs) were 2.78% and 1.53%, respectively. This flexible property holds promise for the construction of wearable electrochemical sensors.

原文链接：https://www.sciencedirect.com/science/article/abs/pii/S0026265X23000619